RuneScape player pulls off a personal Shawshank Redemption: Grinds his way out of one-zone house arrest by grinding a raid 2,000 times over 10,000 hours: 'It was all worth it'

Have you heard of Cookie Clicker? It's an idler game where you click a cookie to get points. You can spend those points on upgrades like automated clicking and more points per click. The goal is to get like a billion points or something but with the upgrades you're eventually getting millions of points a second without even clicking. Now imagine saying "I want to hit a billion points without buying a single upgrade. I'm literally just going to click the cookie a billion times." That's what this guy did, but with Old School Runescape.

There's been a trend of extreme OSRS players trying to one up each other in dedicating years of their life to doing a repetitive task for 18 hours a day, every day.

Not much to understand. A chunk is a small part of a map. People do challenges to do everything in a chunk then move to the next. This guy chose a part of a map that took hundreds of hours to complete and did it.